Item8792: pre/post install & uninstall routines not run when extension installed by bin/configure

This is addressed by Tasks.Item8640 in 1.1, but 1.0 needs a fix to 1.0.9

The extender.pl routine only calls the pre/post routines when extender.pl does the unpack of the extension archive. When the web bin/configure EXTEND.pm unpacks the archive, the pre/post routines get skipped for that extension. However if dependencies are resolved by extender.pl, those archives get unpacked by extender.pl, so the pre/post routines are executed.

extender.pl should be changed to always invoke the pre/post routines, regardless of whether or not extender.pl unpacked the archive.